Number of Huts Puzzle

#135

In a village, there are 100 huts,

numbered from 1 to 100.
Someday..a visitor try to find all the huts which contains number "9"
How many huts he should find ??
and how many 9's are there  ?

  Difficulty Level - 2/5

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  Solution : 

   19 huts and twenty 9's.